Using 4 tubes, this 1924 receiver combines new technologies as an intermediate frequency stage that was already beginning to appear. Listening is via phone and battery power.
In the figure we have the way to use the transistors of an old-paired pair as a trigger circuit. The...
We found this synchrodyne receiver for the medium or short-wave band in the Radio Electronics...
This old circuit, from a 1992 documentation, was used with tape recorders acting as playback. The...